private void CreateDropTarget()
{
OleDropTarget odt = new OleDropTarget(this, _owner);
if (OleContext.Current?.RegisterDragDrop(Handle, odt) ?? false)
{
_dropTarget = odt;
}
}
public Task <DragDropEffects> DoDragDrop(PointerEventArgs triggerEvent,
IDataObject data, DragDropEffects allowedEffects)
{
Dispatcher.UIThread.VerifyAccess();
triggerEvent.Pointer.Capture(null);
OleDragSource src = new OleDragSource();
DataObject dataObject = new DataObject(data);
int allowed = (int)OleDropTarget.ConvertDropEffect(allowedEffects);
UnmanagedMethods.DoDragDrop(dataObject, src, allowed, out var finalEffect);
return(Task.FromResult(OleDropTarget.ConvertDropEffect((DropEffect)finalEffect)));
}
public Task <DragDropEffects> DoDragDrop(IDataObject data, DragDropEffects allowedEffects)
{
Dispatcher.UIThread.VerifyAccess();
OleDragSource src = new OleDragSource();
DataObject dataObject = new DataObject(data);
int allowed = (int)OleDropTarget.ConvertDropEffect(allowedEffects);
int[] finalEffect = new int[1];
UnmanagedMethods.DoDragDrop(dataObject, src, allowed, finalEffect);
return(Task.FromResult(OleDropTarget.ConvertDropEffect((DropEffect)finalEffect[0])));
}
public void Dispose()
{
if (_dropTarget != null)
{
OleContext.Current?.UnregisterDragDrop(Handle);
_dropTarget = null;
}
if (_hwnd != IntPtr.Zero)
{
UnmanagedMethods.DestroyWindow(_hwnd);
_hwnd = IntPtr.Zero;
}
if (_className != null)
{
UnmanagedMethods.UnregisterClass(_className, UnmanagedMethods.GetModuleHandle(null));
_className = null;
}
}
public unsafe Task <DragDropEffects> DoDragDrop(PointerEventArgs triggerEvent,
IDataObject data, DragDropEffects allowedEffects)
{
Dispatcher.UIThread.VerifyAccess();
triggerEvent.Pointer.Capture(null);
using var dataObject = new DataObject(data);
using var src = new OleDragSource();
var allowed = OleDropTarget.ConvertDropEffect(allowedEffects);
var objPtr = MicroCom.MicroComRuntime.GetNativeIntPtr <Win32Com.IDataObject>(dataObject);
var srcPtr = MicroCom.MicroComRuntime.GetNativeIntPtr <Win32Com.IDropSource>(src);
UnmanagedMethods.DoDragDrop(objPtr, srcPtr, (int)allowed, out var finalEffect);
// Force releasing of internal wrapper to avoid memory leak, if drop target keeps com reference.
dataObject.ReleaseWrapped();
return(Task.FromResult(OleDropTarget.ConvertDropEffect((Win32Com.DropEffect)finalEffect)));
}